Gate for molds and castings formed thereby



(No Model.)

SI JIX GATE FOR MOLDSAND GASTINGS FORMED THERBBYl No. 477,320. PatentedJune 21, 189-2.-

"m: mums PETERS $0., Moro-mum, WASHINGTON, n. c,

- UNITED STATES PATENT OFFICE.

STEPHEN JARVIS ADAMs, OF PITTSBURG, PENNSYLVANIA.

GATE FOR MO LDS AND CASTINGS FORMED TH EREBY.

SPECIFICATION forming part of Letters Patent No. 477,320, dated June 21,1892.

Application filed March 11, 18 9li Serial No. 334,554. (No model.)

legheny and State of Pennsylvania, have invented a new and usefulImprovement in Gates for Molds and Castings Formed Thereby; and I dohereby declare the following to be a full, clear, and exact descriptionthereof.

My invention relates to the runners leading to castings and to theformation of the same, and is specially, though not exclusively,applicable to such castings having wings thereon, such as wagon boxeshaving lugs or feathers at the larger end thereof to enter seats formedin the axle-hub to prevent the box from turning. It is a well-known factthat in most cases the bodies of these wagonboxes are lathe-turned to acertain extent after casting, the upper and the lower ends being turned,the interior of the box being reamed out and the outer. surface of thebox being turned off, so that the box will be properly centeredwithinthe hub.

It has been customary in mostof the ordinary wagon-boxes to have thelugs come out flush with the upper edge or end of the wagonbox, and thegate or feeder feeding to the mold-cavity usually communicated with thetop edge of the mold-cavity where the cavity was formed in a single orone-part mold. Where, however, the gate communicated with the top edgeof the mold-cavity, it. left asmall fin on such edge, which it wasrequired to turn off in fitting up the casting, and such tin orenlargement on the edge of the casting was liable to catch the tool ofthe lathe and dull or break the same, and in anycase if the lugs cameout to the same level with the edge it was also necessary to turn themoft, which required great care and more work than desirable. To overcomethis difficulty where these castings have been formed in two-part molds,the upper edge of the lug has been formed inclined from the upper edgeof the box downwardly toward the outer edge of the lug or feather; butit has not been practicable to cast this form of lug in a single-partmold, and the castings made in the two-part mold are objectionable, asthe castings formed therein have certain longitudinal fins on the outersurface thereof, which require the outer surface of the box to be turnedoff and will dull or break the tools.

A principal object of my invention therefore is to produce such luggedand feathered castings in single-part moldsin such manner that the upperend of the lugs may be'made tapering from the upper edge or face of thecylindrical casting, so that they will not require any dressing orfinishing, and that the gate or runner supplying the metal to themold-cavity can be broken from the casting without leaving any tin orsuch mark even with the top edge or face of the casting.

To these ends my invention consists, generally stated, in a mold forwagon-boxes or other similar tubular articles having a moldcavity, afeather-cavity, and a gate or runner cavity above the feather-cavity ofa greater width and thickness than the feather-cavity and communicatingtherewith by abrupt angles, so that along the edge of the feather orother part of the casting formed in the mold there will be an angle,which will leave a weak place, and the metal can be broken off at thatpoint, leaving the feather orbody of the casting extending atwhateverincline or angle to the main body is desired.

It also'consists in improvements in the pattern for forming the mold andthe casting formed in the mold, as will be hereinafter more particularlydescribed and claimed.

To enable others skilled in the art to make and use my invention, I willdescribe the same more fully, referring to the accompanying drawings, inwhich- Figure l is a perspective view of the pattern employed forforming the mold. Fig. 2 is a longitudinal section of the mold formed bythe pattern having the core therein. Fig. 3 is a side view of thepattern. Fig. 4 is a view of the casting made. Fig. 5 is a view of thecastings as formed in the mold, showing the feeder broken off from oneplug and ex tending down from the other; and Fig. 6 is a view of thefinished casting.

Like letters of reference indicate like parts in each figure. I i

I will describe my invention specially in connection with a wagon-box,to'which itis specially appiicable, its application to other castingsdepending, of course, on the shape of the casting to be made.

The pattern a has the head I) for forming the core-seat or print for thehead of the core and the extension 0 for forming the core-seat for thelower or small end of the core. The

body (1 of the pattern forms the mold-cavity,

which the air and gas "may escape from the mold and the metal riseduring casting. Such pattern 1s employed in the usual way in form ingsingle-part molds, one or more of such patterns being secured to apattern-plate and extendlng up wlthin a flask, as at g, and the sandbeing compacted within the mold, so asv to form a cavlty correspondingwith the pat-,

tern a.

It will be noticed that the gate-patterns f are connected to thelug-patterns by what. mlght be termed an angle-joint h-that is to say,that there are abrupt angles at the points of juncture on the threesides of the lug between the same and the gate-patter nand that thegate-pattern is of greater width I and thickness than the lug-pattern atthe point of jointure therewith, so that in the casting formed therewill be a runner-casting of greater width and thickness than the lugandconnected thereto by angle-joints, as herein-:

after described.

The mold-cavity formed by the pattern corresponds to the same, havingthe main moldcavity 'L, the lug-cavities 7c, and the gates or runners Z,and the core m [its within the mold- I cavityits core-head m forming theupper edge or face of the mold-cavity, while, as said head m iscylindrical, it forms the inner wall of the pouring-gate l. The coreextends through the mold-cavity and is centered on the lower endthereof. As the mold is so constructed it will be seen that it has amain mold-cavity, a feather or lug cavity, and a gate or runner cavityabove the feather or lug cavity and of greater depth and width than thesame and connected to such feather or lug cavity by angle-joints, as atn. In the casting of the metalin such mold the metal enters through oneor the other of the gate or runner cavities and flows through the sameand through the lug-cavity communicating therewith into the mainmold-cavity, filling such main mold-cavity and entering into theopposite lug-cavity and the opposite runnercavity, either rising in thesame where the mold is poured from above or descending into the samewhere the metal enters the mold from below. When the casting is formedand removed from the sand, it will be found that it has a main body 19,a lug or lugs 0 a gate or runner casting 8, extending up from each lug,and that such gate or runner casting is connected to the lug by anangle-joint t, while the gate or runner casting is of greater width andthickness than the lug. It will also be noticed that the angle 15between the gate or runner casting s and the lug 1" extends around threesides of-the lug, while the opposite'side of the lug forms part of thebox, and that such gate or runner casting extends above the box and isotherwise unsupported. The anglejoint t between the gate or runnercasting and the lug therefore forms a weak place along which the gate orrunner casting can be broken from the lug, and such casting can beknocked off either by hand orwillbreak from the lugs in theturning-barrel, breaking off along the angle-joint t, as that is theweakest point between the lug or gate and runner casting. Thisangle-joint t can be made at an in:

cline downwardly from the upper face of the casting, and therefore, whenso formed, as the top edge of the lug extends at a downward incline fromthe top edge or face of the main casting, when such face of the maincasting is dressed off it will not be necessary to turn the face of thelugs and'the lugs will not extend up above the top edge or face of thecasting, the turning of such lugs being therefore avoided.

It will be seen from the above description that the principle on whichthe casting and the gate or runner casting are formed is that the gateor runner casting shall be of greater thickness and width than the lugor feather, or that part of the casting with which it conmeets, and theweak line along which the same shall break is formed by the abrupt anglenecessary to connect the feather or other part with the gate-castin g,of greater thickness and width, as distinguished from the-ordinary wayheretofore practiced, in which the ordinary runner-casting has been madeof smaller diameter at the point where it is to be broken off, so as toleave the weak point for breaking.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. A mold for forming wagon-boxes and like articles having feathers orlugs thereon, having a main mold-cavity, a feather or lug cavityextending along the same, and a gate or runner cavity above thefeather-cavity and of greater width and thickness than thefeathercavity, said gate or runner cavity communicating with the,feather-cavity by abrupt angles,substantially as and for the purposesset forth.

2. In tubular castings having feathers or lugs thereon, the combination,with the main casting having a feather or lug formed thereon at one endthereof, of a gate or runner casting extending above the lug and ofgreater width and thickness than the lug, said gate or runnercasting-connecting with the lug by abrupt angles, substantially'as andfor the purposes set forth.

In testimony whereof I, the said STEPHEN JARVIS ADAMS, have hereunto setmy hand.

STEPHEN JARVIS ADAMS.

Witnesses:

JAMES I. KAY, J. N. OooKE.

